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Which two substances must be present for iron to rust?

Answer and explanation

Correct answer: Oxygen and water (moisture)

Rusting is a slow corrosion process in which iron is oxidised in the presence of both oxygen and water or moisture. The product is hydrated iron(III) oxide, commonly called rust. Therefore, option A is correct. Oxygen alone cannot normally produce rust on dry iron, and moisture alone without an oxygen supply is also insufficient.

Related tags

Class 10 ScienceChemical ReactionsRustingCorrosionOxidationChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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